TB9400/TN9275 Installation and Operation Installation 57
© Tait International Limited May 2023
strongly recommended that you ensure that the cooling airflow is not
restricted.
Notice The cooling fans are mounted on the front panel and will only
operate when the panel is fitted correctly to the front of the subrack. To
ensure adequate airflow through the base station, do not operate it for
more than a few minutes with the front panel removed (e.g. for servicing
purposes).
4.1.4 Ambient Temperature Sensor
The ambient temperature reading for the base station is provided by the
temperature sensor located on the front panel circuit board.
4.1.5 Cabinet and Rack Ventilation
The cooling airflow for the subrack enters through the front panel and exits
at the rear. For optimum thermal performance, the heated air that passes
through a base station must never be allowed to re-enter the air intakes on
the front panel. Any space at the front of the cabinet not occupied by
equipment should be covered by a blanking panel. Refer to Figure 4.1 on
page 58.
Equipment installation should observe the following guidelines:
■ The recommended maximum number of subracks in a 38U cabinet is
five as shown in Figure 4.1 on page 58
■ Any space at the front of the cabinet not occupied by equipment should
be covered by a blanking panel, refer to Figure 4.1 on page 58
■ Subrack placement in the cabinet should include a 2U gap at the top of
the cabinet
■ To allow enough cooling airflow through a cabinet-mounted base
station, the cabinet should allow for 50 cu.ft/min for each subrack
(0.024 cu.m/s)
■ To ensure adequate ventilation, the cabinet should have a vent at the top
with an area of approximately 23in
2
(150cm
2
) per subrack, or a similar
area of ventilation per subrack at the rear of the cabinet
■ The maximum ambient temperature at the base station front panels must
not exceed +140°F (+60°C)
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